linux-kernel - Re: [PATCH] remoteproc: mediatek: Zero out only remaining bytes of IPI buffer

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Date: Tue, 21 May 2024 10:47:33 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: andersson@...nel.org, matthias.bgg@...il.com,
	linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH] remoteproc: mediatek: Zero out only remaining bytes of
 IPI buffer

On Mon, May 20, 2024 at 01:27:24PM +0200, AngeloGioacchino Del Regno wrote:
> In scp_ipi_handler(), instead of zeroing out the entire shared
> buffer, which may be as large as 600 bytes, overwrite it with the
> received data, then zero out only the remaining bytes.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  drivers/remoteproc/mtk_scp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index e5214d43181e..dc70cf7db44d 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -117,8 +117,8 @@ static void scp_ipi_handler(struct mtk_scp *scp)
>  		return;
>  	}
>  
> -	memset(scp->share_buf, 0, scp_sizes->ipi_share_buffer_size);
>  	memcpy_fromio(scp->share_buf, &rcv_obj->share_buf, len);
> +	memset(&scp->share_buf[len], 0, scp_sizes->ipi_share_buffer_size - len);

I will apply this patch when rc1 comes out next week.

Thanks,
Mathieu

>  	handler(scp->share_buf, len, ipi_desc[id].priv);
>  	scp_ipi_unlock(scp, id);
>  
> -- 
> 2.45.1
>